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. 2016 Feb 29;25(1):33–40. doi: 10.1007/s10068-016-0005-y

Determination of matrix effects occurred during the analysis of organochlorine pesticides in agricultural products using GC-ECD

Nam-Hoon Kim 1,✉, Jeong-Sook Lee 1, Kyung-Ai Park 1, Yun-Hee Kim 1, Sae-Ram Lee 1, Jeong-Mi Lee 1, In-Sil Yu 1, Kweon Jung 1, Young-Ki Lee 2
PMCID: PMC6049384  PMID: 30263233

Abstract

Matrix effects observed during the multiresidue analysis of seven organochlorine pesticides in six different agricultural products with GC-ECD were assessed. The presence of matrix coextractives, a major cause of observed matrix effects, directly and/or indirectly influenced the chromatographic responses of some pesticides. Two types of external calibrations, solvent calibration (SC) and matrixmatched calibration (MC), were used to assess matrix effects. Greater matrix effects were observed at the lower concentrations of each pesticide. The extent of matrix effects varied unpredictably with matrix type. Among the analyzed pesticides, iprodione, cyhalothrin, and cypermethrin exhibited greater matrix effects (>150%) for almost all matrices. The pesticide recovery rates obtained with MC were not statistically different from a 100% recovery rate in most samples, which indicates that MC may diminish the overestimates occurred due to matrix effects in GC analysis.

Keywords: GC-ECD, matrix effect, solvent calibration, matrix-matched calibration, recovery rate

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